Moisture management
Can support water binding and processing yield in suitable protein-based formulations.
Food phosphate · INS 451(i) · STPP
Food Grade Sodium Tripolyphosphate
Bespring supplies food grade sodium tripolyphosphate (STPP, INS 451(i)) as white powder or granules for qualified food-processing applications. This page separates verified chemical identity, our commercial reference limits and the details a buyer should confirm before ordering.
- CAS number
- 7758-29-4
- INS number
- 451(i)
- Formula
- Na5P3O10
- Assay
- ≥ 85.0%
Include required standard, quantity, pallet preference, destination and application for an efficient review.
Defined specificationEight key quality parameters listed
25 kg packagingKraft paper outer bag with inner PE bag
24-month shelf lifeFrom manufacturing date under stated storage
Container optionsWith or without pallets
Product overview
What is food grade STPP?
Food grade sodium tripolyphosphate is the pentasodium salt of triphosphoric acid. It is also known as pentasodium triphosphate and carries Codex INS number 451(i). The material is supplied as white granules or powder and is formulated into selected processed foods when phosphate functionality is required.
For procurement, “food grade” should never be treated as the whole specification. Buyers should also confirm assay, P2O5, insoluble matter, contaminant limits, particle form, test methods and destination-market documentation.
Formulation value
Why is STPP used in food processing?
STPP can provide several technical functions, but performance depends on the full phosphate system, raw material, process conditions and legal use level.
Texture support
Helps processors manage bite, consistency and finished-product texture in validated recipes.
Emulsification
Supports stable fat, protein and water systems in selected processed-food applications.
Sequestration
Binds certain metal ions that may otherwise interfere with product or process performance.
Typical application areas
Food grade STPP applications
The intended food category, dosage and declaration must be reviewed against the regulations of the manufacturing and destination markets.
Meat, poultry & seafood
STPP is considered in validated brines, marinades and processed protein systems where moisture retention, texture and process yield are important.
- Processed meat and poultry products
- Selected fish and seafood products
- Brine and phosphate blend systems
Processed cheese & formulated products
Food phosphates may be considered in permitted processed-cheese and broader formulated-food systems for emulsifying-salt, stabilization or mineral-ion management functions.
- Selected processed-cheese applications
- Emulsified or formulated food systems
- Compound phosphate blends
Product specification
Food grade sodium tripolyphosphate specification
The following limits reproduce a source-specific commercial product sheet. They are not a universal definition of food grade STPP; the signed specification, agreed test methods and batch COA govern an order.
| Test item | Specification | Expression |
|---|---|---|
| Assay (Na5P3O10) | ≥ 85.0 | % |
| P2O5 | 56.0–58.0 | % |
| Water-insoluble matter | ≤ 0.1 | % |
| Fluoride | ≤ 50 | ppm |
| Arsenic | ≤ 3 | ppm |
| Heavy metals | ≤ 10 | ppm |
| Lead | ≤ 4 | ppm |
| Appearance | White granules or powder | Visual |
Data-sheet notice: Results may differ because of variations in test conditions, equipment and methods. Confirm methods, sampling rules and acceptance criteria before contracting.
JECFA gap to resolve: this commercial reference lists fluoride at ≤ 50 ppm, while the cited JECFA monograph lists ≤ 10 mg/kg. If JECFA conformance is required, ask for the current signed specification and batch COA; do not infer conformance from the product name alone.
Supplier qualification
What to confirm before buying food grade STPP
A useful quotation should identify the exact grade and acceptance criteria—not only the abbreviation “STPP.”
Identity & food standard
Confirm sodium tripolyphosphate, CAS 7758-29-4, INS/E451(i), the required food standard and intended destination market.
Specification & methods
Align assay, P2O5, insoluble matter, contaminants, units, sampling and analytical methods.
Form & process fit
State powder or granular preference, application and recipe conditions. If handling or hydration rate matters, also define particle size, bulk density and phase-composition requirements.
Documents & logistics
Request the current specification, batch COA and applicable supporting documents; confirm bag, pallets, quantity and destination.
Grade boundary: Food grade and technical or detergent grades should not be treated as interchangeable. Qualify the grade, facility documentation and intended legal use before approval.
Packing & logistics
Built for export handling
Final loading depends on container limits, route, pallet dimensions and shipping requirements.
- Standard packagingNet 25 kg per bag; outer kraft paper bag with inner PE bag.
- Without palletsReference load: 23 MT per 20-foot general-purpose container.
- With palletsReference load: 18 MT per 20-foot general-purpose container.
Storage & shelf life
Keep STPP dry and segregated
- Warehouse conditionsStore in a ventilated, dry, shaded and cool warehouse.
- SegregationDo not store or transport together with poisonous materials.
- Shelf life24 months from the manufacturing date under the specified storage conditions.
Related selection resources
Compare food phosphates and application guidance
Use these pages to compare adjacent ingredients and narrow the application before supplier qualification.
Related productSodium Hexametaphosphate (SHMP)Compare another sequestrant and functional phosphate.
Related productTetrasodium Pyrophosphate (TSPP)Review identity and supplied reference specification.
Related productFood Phosphate BlendsExplore application-specific multi-phosphate systems.
Application guideSTPP in Meat ProcessingReview formulation variables and process considerations.
Solution guideSeafood Phosphate SelectionStructure a seafood-focused phosphate brief.
Buyer guideSTPP vs SHMPCompare identity, function and procurement questions.
Buyer questions
Food grade STPP FAQ
What is food grade STPP used for?
It is used in permitted food applications where phosphate functionality is needed, including selected meat, poultry, seafood, dairy and processed-food formulations. The precise function and use level depend on the recipe, process and local regulations.
What is the food additive number for sodium tripolyphosphate?
Pentasodium triphosphate is identified by Codex INS number 451(i). Market-specific names and permitted applications can differ, so the buyer should verify destination-market requirements.
Is this specification the same as a batch COA?
No. This page presents the supplied reference limits. A certificate of analysis reports results for a particular batch and should be checked against the agreed purchase specification.
Does the reference specification shown here conform to JECFA?
Not as presented. Its fluoride limit is ≤ 50 ppm, compared with ≤ 10 mg/kg in the cited JECFA monograph. Buyers requiring JECFA conformance should obtain and approve a current signed specification with the required limits and test methods before ordering.
Are food grade and industrial grade STPP interchangeable?
No. The same chemical name does not establish suitability for food use. Confirm the offered grade, specification, supporting documentation, manufacturing controls and regulatory suitability for the intended market.
How is food grade STPP packed and loaded?
Standard packing is a net 25 kg kraft paper outer bag with an inner PE bag. Reference loading is 23 MT per 20GP without pallets or 18 MT with pallets, subject to shipment confirmation.
What information is needed for an STPP quotation?
Provide the required food standard, powder or granular preference, quantity, packaging, pallet requirement, destination port, application and delivery target.
Can I request product documents or a sample?
Ask the sales team for the specification, TDS, SDS, applicable quality documents and sample availability. State your application and destination so the relevant documents can be reviewed.
Technical content checked against the cited FAO/WHO JECFA monograph and U.S. FDA food-substance record on 22 September 2026.
Start a sourcing conversation
Request an STPP quote
Share the commercial and technical details that affect product selection, container loading and landed cost.
- Required food standard and particle form
- Quantity, packaging and pallet preference
- Destination country or port
- Application and delivery timing